david letterman, 290 jokes made about republicans including arnold schwarzenegger, paul lieian and chris christie, 138 about democrats. only two others were the top ten bill clinton and joe biden. do you have an explanation. [ laughter ] >> the romney jokes write themselves. thank you, good night. [ laughter ] >> i think look, it's media bias. i remember saturday night live, when chevy chase doing gerald ford i think that made a difference in the nation. humor does that. >> ford was a football player and a skier, downhill skier, most athletic president was portrayed as a bunglar that could hardly walk. >> you can't changes the numbers but i would like to point out that jon stewart and steven col bevtd who demographic skew is a little bit younger but very good about making fun of both candidates. pretty equally. >> the excuse is the writers live in los angeles and new york city. they are part of those communities. they are the two most liberal cities in the united states. >> when clinton it was president it was about monica lewinsky. >> but except mitt romney is not president. it happened